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# WHY? https://github.com/hatena/Hatena-Textbook-JavaScript/blob/master/async/promise.md 上のリンクでは、次のようなpromiseコードが書いています。 ```js let db; MongoClient.connect('mongodb://localhost:27017/rssDataBase') .then((_db) => { db = _db; return fs.readFile('./feed.xml', 'utf8'); }) .then(rssString => parseString(rssString)) .then((result) => { const items = result.rss.channel[0].item; return Promise.all(items.map(item...
誤字修正、セキュリティ目次追加
**Description** I developed my app with Expo and implement IAP subscription with react-native-iap. However, I discovered that so many 'android' users pressed start subscription button but they canceled after 5-10...